电气化铁路接触网雷电感应过电压计算及其闪络概率研究

Research on the lightning induced over-voltage and the corresponding flash probability of the catenary system in the electric railway

我国电气化铁路牵引网额定工作电压为27.5 kV,其绝缘水平与电力系统35 kV配网架空线路相当,因此对其开展雷害研究必须考虑雷电感应过电压。在建立接触网架空线路、钢轨和接触网支柱模型的基础上,基于Agrawal场线耦合模型对接触网线路的雷电感应过电压进行了仿真研究,并结合电气几何模型对接触网感应雷击闪络概率进行了计算。

The operating voltage of the electric railway is 27.5 kV, whose insulation level is equivalent to the 35kV distribution grid of the power system, so the lightning induced over-voltage must be considered. The Agrawal et. al field-to-line coupling model is adopted, and the overhead lines of the catenary and the steel rail are viewed as a multi- conductor transmission line system, whose distributed parameters are computed by the analytical formula and electro- magnetic finite element method. At last, the flashover probability of the catenary system is calcalated cmbined with the electro-geometrical model.